General consensus on boltons to gain the most HP.

red6spd

Its been proven that the first mod you do to the Z nets you about 15-20HP, after that you are only going to gain 5-10 maybe less with all the other mods. Also what I see is missing from this thread is the importance of a tune if you have fill bolt-on's. The Z tends to run a little lean with CAI, CBE,TP, so you might want to look into a tune as a saftey precaution as well. From what I have seen on this forum most guys are putting down 275-285WHP bone stock. After full bolt-on's and a tune it looks like there making about 330-340WHP so thats a gain of about 55+ HP

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2010 Base+Sport 6spd: Stillen G3, FI Non-Resonated CBE, FI Non-Resonated Test Pipes, UpRev Tuned, Custom 24R Oil Cooler, JDM Rear Fog-OEM Harness.
???Whp ???WTQ (Will find out come spring time)

pulpz

Which I would be OK with, assuming ~$3K investment. Keeps NA reliability, resale, and avoids headaches of FI which done right will push ~$10K.

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2016 Cayman GTS 6MT / 2017 Q60 Sport / 2012 Acura TL SH-AWD / 2015 Lexus IS 350 AWD F-Sport (Sold) / 2009 PG 370Z Sport 6MT, (Sold) / 2003 SS 350Z Enthusiast 6MT (Sold)